Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual grade Alain Prost dirigiu?
 ###Tabelas: CREATE TABLE law_enforcement (law_enforcement_id AUTO_INCREMENT PRIMARY KEY, Character VARCHAR, Position VARCHAR, Actor VARCHAR, First Episode VARCHAR, Final Episode VARCHAR, Duration VARCHAR, Final Episode Count INT) CREATE TABLE constituents (constituents_id AUTO_INCREMENT PRIMARY KEY, Date INT, 2 January 2007 VARCHAR, 19 October 2009 VARCHAR, 5 November 2010 VARCHAR, 16 December 2011 VARCHAR, 30 March 2012 VARCHAR) CREATE TABLE winners_by_club (winners_by_club_id AUTO_INCREMENT PRIMARY KEY, Clubs VARCHAR, Winners INT, Runners-up INT, Total finals INT, Winnig years VARCHAR) CREATE TABLE government (government_id AUTO_INCREMENT PRIMARY KEY, Party VARCHAR, % votes INT, % change INT, Seats INT, Change INT) CREATE TABLE race (race_id AUTO_INCREMENT PRIMARY KEY, Driver VARCHAR, Constructor VARCHAR, Laps INT, Time/Retired VARCHAR, Grid INT)  
SELECT SUM Grid FROM race WHERE Driver = alain prost